At the end of the day, other than the benefit of having a nearby burial water for dead fish, I only see extra cleaning (toilet+tank+urinal). That and lots of excuses for missing the toilet when peeing (“I turned around to watch the fish”) and staying in the bathroom for hours on end. I wonder what would happen if you put one of those blue pucks in the toilet/fish tank….mutant fish? Probably nothing as exciting as that. Just dead bluey-orangey (green even?) fish.